Self-study
The tiny hummingbird weighs little, but its egg is 15 percent of the adult hummingbird's weight. ███ ██████ ███ ██████ ██ ██ █████ █████ ███ ████ ███████ ████ █████ ██ █ ████████████ ███ █ ███████ ███ ██ ████ █████ █ ███████ ██ ███ ███ ███████ ██ █████ ████████ ████ ██████ ███ ███████ ████ █ ██████ ████ ██ ███ ████ ██ ████ ███ ███████ ██ ███ ███ ███████
Summary
A hummingbird’s egg accounts for 15 percent of an adult hummingbird’s weight. An adult goose is much larger than a hummingbird, but a goose’s egg accounts for only 4 percent of an adult goose’s weight. An adult ostrich is much larger than a goose, but ostrich eggs only account for 1.6 percent of an adult ostrich’s weight.
Strongly Supported Conclusions
The larger a bird species is, the smaller the ratio is between egg weight and the body weight of an adult bird.
17.
Which one of the following ████████████ ██ ████ ███████████ ██ ███ ██████████ ██████
a
The eggs of █████████ ████ ███████ ████ ██████ ██ █████ █████ ██ ██████ ██ ███████
This answer is unsupported. In the stimulus, we are comparing egg weight and volume to the weight and volume of an adult bird. This answer is comparing egg weight and volume of one species compared to the egg weight and volume of another.
b
The smaller and ███████ ███ ███████ █████ ███████ ██ █ ████ ███████ ████ ███ ██████ ███ ███████ ███ ████ ██ ████ ███████ ████
This answer is unsupported. From the stimulus, we only know that the ratio between the weight and volume of an egg increases the smaller the adult bird is. This doesn’t mean that the eggs are larger, just that they account for a bigger proportion of an adult’s weight.
c
The ratio of ███ ██████ ██ █ ███████ ██ ████ ██████ ██ ██ █████ ██████ ██ ████ ███████ ██ ███████ ███ ██████ █████ ████ ███ ███████ █████
This answer is strongly supported. This answer accurately captures the comparative difference of proportion between egg weight and volume of different bird species.
d
The size of ██████ ████ ██████ ███████ ████ ███████ ██ ███████ ███ ███ ██████ ██████ ██ ███ ██████ ███ ██████ ██ ███ █████ █████
This answer is unsupported. We don’t know from the stimulus anything about the size of any adult bird’s eggs. Rather, we only know something about the proportion of egg weight and volume compared to an adult bird.
e
Bird species vary ████ ██ ███ ████ ████ ████ ██ ██ ███████ ████ ████ ███ ███████
This answer is unsupported. We don’t know from the stimulus whether bird species vary in egg size at all. We only know that in different species of birds, egg weight and volume accounts for a different proportion of an adult bird’s weight.